Q. A long wire lying along the x-axis carries a current of 2.60 A in the +x direction. There is a uniform magnetic field present, given by B=0.003i + 0.004j + 0.002k, where i, j, k are the unit vectors along the cartesian coordinate axes' in units of Tesla. Calculate the y-component of the magnetic force acting on a segment of wire of length L = 22.0 cm.
Q. Suppose the roller coaster (h1 = 32 m, h2 = 11 m, h3 = 30) passes point A with a speed of 1.20 m/s. If the average force of friction is equal to one third of its weight, with what speed will it reach point B? The distance traveled is 45.0 m.